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GB1512222A - Data processing apparatus - Google Patents

Data processing apparatus

Info

Publication number
GB1512222A
GB1512222A GB32181/75A GB3218175A GB1512222A GB 1512222 A GB1512222 A GB 1512222A GB 32181/75 A GB32181/75 A GB 32181/75A GB 3218175 A GB3218175 A GB 3218175A GB 1512222 A GB1512222 A GB 1512222A
Authority
GB
United Kingdom
Prior art keywords
register
signals
control word
field
group
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB32181/75A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Publication of GB1512222A publication Critical patent/GB1512222A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F9/00—Arrangements for program control, e.g. control units
    • G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
    • G06F9/22—Microcontrol or microprogram arrangements
    • G06F9/26—Address formation of the next micro-instruction ; Microprogram storage or retrieval arrangements
    • G06F9/262—Arrangements for next microinstruction selection
    • G06F9/264—Microinstruction selection based on results of processing
    • G06F9/267—Microinstruction selection based on results of processing by instruction selection on output of storage

Landscapes

  • Engineering & Computer Science (AREA)
  • Software Systems (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Executing Machine-Instructions (AREA)

Abstract

1512222 Microprogramming INTERNATIONAL BUSINESS MACHINES CORP 1 Aug 1975 [24 Sept 1974] 32181/75 Heading G4A The address of a group of control words (microinstructions) in a control store 21 is provided by a field 12F of a control word register 12, and one control word of the group read out from store 21 is selected for output, 15, in dependence on a logical combination of machine status signals A, B with a set of signals T1-T8 obtained from a second field 12C of the control word register. The arrangement permits complete flexibility in selection of one control word from a group for a given set of status signals, and elimination of duplicate control words in store 21. It is also possible for two different microprogram routines to call for the same control word under different machine status conditions by suitable choice of the field 12C in each case. The signals T1-T8 are loaded into a BAXR register 11 from the field 12C of a current control word in register 12 when enabled by a field 12B of that control word. Once loaded in register 11, the BAXR bits may be used with subsequent control words in register 12 when selected by a field 12A of those control words, otherwise a predetermined pattern of signals T1-T8 is generated by gates in a block 14. The machine status signals A, B may be derived by masking a plurality of machine condition signals a-s (not necessarily all discrete) with fields 12D, 12E of the current control word in register 12. For complete word selection flexibility, register 11 has N2<SP>N</SP> bits where N is the number of status signals (A, B where N=2). The word selection decoder 13 may comprise 2<SP>N</SP> groups of 2<SP>N</SP> gates, a corresponding gate in each group being partially enabled by the N status signals, and each gate in a group being partially enabled by the same state of a different set of N bits 7.
GB32181/75A 1974-09-24 1975-08-01 Data processing apparatus Expired GB1512222A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/508,797 US3958227A (en) 1974-09-24 1974-09-24 Control store system with flexible control word selection

Publications (1)

Publication Number Publication Date
GB1512222A true GB1512222A (en) 1978-05-24

Family

ID=24024114

Family Applications (1)

Application Number Title Priority Date Filing Date
GB32181/75A Expired GB1512222A (en) 1974-09-24 1975-08-01 Data processing apparatus

Country Status (5)

Country Link
US (1) US3958227A (en)
JP (1) JPS581466B2 (en)
DE (1) DE2536622C2 (en)
FR (1) FR2286438A1 (en)
GB (1) GB1512222A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2133189A (en) * 1982-12-31 1984-07-18 Philips Nv Microprogram arrangement
US4933091A (en) * 1988-03-25 1990-06-12 Henkel Kommanditgesellschaft Auf Aktien Process for coagulating lacquers and the like

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4042913A (en) * 1976-04-30 1977-08-16 International Business Machines Corporation Address key register load/store instruction system
US4124893A (en) * 1976-10-18 1978-11-07 Honeywell Information Systems Inc. Microword address branching bit arrangement
US4118773A (en) * 1977-04-01 1978-10-03 Honeywell Information Systems Inc. Microprogram memory bank addressing system
DE2747304C3 (en) * 1977-10-21 1981-03-26 IBM Deutschland GmbH, 70569 Stuttgart Micro-command control device
US4181942A (en) * 1978-03-31 1980-01-01 International Business Machines Corporation Program branching method and apparatus
JPS5748139A (en) * 1980-09-04 1982-03-19 Nec Corp Microprogram control device
US4434465A (en) 1981-04-13 1984-02-28 Texas Instruments Incorporated Shared microinstruction states in control ROM addressing for a microcoded single chip microcomputer
US4531199A (en) * 1981-06-01 1985-07-23 International Business Machines Corporation Binary number substitution mechanism in a control store element
US4422144A (en) * 1981-06-01 1983-12-20 International Business Machines Corp. Microinstruction substitution mechanism in a control store
JPS57199050A (en) * 1981-06-01 1982-12-06 Ibm Micro order control memory mechanism
JPS5896349A (en) * 1981-12-02 1983-06-08 Hitachi Ltd Microprogram control system
JPS58114244A (en) * 1981-12-28 1983-07-07 Nec Corp Microprogram controller
JPH04328634A (en) * 1991-04-26 1992-11-17 Nec Corp Microprogram controller
US5386549A (en) * 1992-11-19 1995-01-31 Amdahl Corporation Error recovery system for recovering errors that occur in control store in a computer system employing pipeline architecture
US5568622A (en) * 1993-04-15 1996-10-22 Bull Hn Information Systems Inc. Method and apparatus for minimizing the number of control words in a brom control store of a microprogrammed central processor
US5812808A (en) * 1996-06-11 1998-09-22 Driker; Benjamin Totally pipelined computer, interconnected with others
US7861071B2 (en) * 2001-06-11 2010-12-28 Broadcom Corporation Conditional branch instruction capable of testing a plurality of indicators in a predicate register
US7127593B2 (en) * 2001-06-11 2006-10-24 Broadcom Corporation Conditional execution with multiple destination stores
US6986025B2 (en) * 2001-06-11 2006-01-10 Broadcom Corporation Conditional execution per lane

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3325785A (en) * 1964-12-18 1967-06-13 Ibm Efficient utilization of control storage and access controls therefor
US3391394A (en) * 1965-10-22 1968-07-02 Ibm Microprogram control for a data processing system
US3445818A (en) * 1966-08-01 1969-05-20 Rca Corp Memory accessing system
US3573854A (en) * 1968-12-04 1971-04-06 Texas Instruments Inc Look-ahead control for operation of program loops
US3656123A (en) * 1970-04-16 1972-04-11 Ibm Microprogrammed processor with variable basic machine cycle lengths
US3728686A (en) * 1971-06-07 1973-04-17 Rca Corp Computer memory with improved next word accessing
US3704448A (en) * 1971-08-02 1972-11-28 Hewlett Packard Co Data processing control system
US3800293A (en) * 1972-12-26 1974-03-26 Ibm Microprogram control subsystem

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2133189A (en) * 1982-12-31 1984-07-18 Philips Nv Microprogram arrangement
US4933091A (en) * 1988-03-25 1990-06-12 Henkel Kommanditgesellschaft Auf Aktien Process for coagulating lacquers and the like

Also Published As

Publication number Publication date
JPS5148240A (en) 1976-04-24
JPS581466B2 (en) 1983-01-11
DE2536622C2 (en) 1983-11-03
FR2286438B1 (en) 1977-12-16
US3958227A (en) 1976-05-18
DE2536622A1 (en) 1976-04-08
FR2286438A1 (en) 1976-04-23

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee